POWERBREATHER SNORKEL

The Powerbreather
is a breathing system (based on the concept of a sealed snorkel) and
developed in Germany. The system uses a patented air flow pumped by a
valve mechanism. The Powerbreather allows only air to pass through the
pipe leading to the mouth of a swimmer. The Powerbreather avoids strain
on the neck muscles, which is usually done by turning the neck and head,
in order to breathe. Thus, the Powerbreather allows the swimmer to
concentrate on his/her technical improvements. The water can not enter
the system, even with the swimmer immersing further, because the two
valves only allow air to be inhaled. source